The 2004 F250/F350 gas engines came with the 4R100 4 speed auto. The 2004 F250/F350 diesel engine came with the new torqueshift 5 speed auto. The 2004 F150 brochure says 'New automatic transmission designed specifically to mate with the new 5.4L 3-valve triton V8 is a new 4-speed automatic transmsion. It's the next generation auto with major enhancements to handle the power and torque of the new 5.4 3-valve engine'. I doubt if you have the 4R100. Philip.